Great start
Noice. I would definatly suggest you add some form of powerups to give the player something to do aside from just bounce on heads. One could maybe be a one-time use bounce bar at the bottom of the screen so you have a second chance at keeping a combo going, some way to get extra lives would be good too. Adding multi-color emoticons could mix things up a bit, ones that change color every second or two. It's a fun, simple game that could have potential for something truely addicting.